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JTWC adheres to the World Meteorological Organization's ( WMO ) rules for storm names and adheres to acknowledged guidelines for intensity of tropical cyclones and tropical storms, with the exception of using the U. S. standard of measuring sustained winds for 1 min instead of the 10 min span recommended by the WMO ( see Saffir-Simpson Hurricane Scale ).
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JTWC and Meteorological
The JTWC is not one of the WMO designated Regional Specialized Meteorological Centres, nor one of its Tropical cyclone warning centres as its main mission is to support the United States Navy and remainder of the federal government.
Also, windspeed advisories differ from the Joint Typhoon Warning Center to the Japan Meteorological Agency as the JTWC uses the U. S. criteria of 1 minute mean to designate maximum sustained winds, while the JMA uses the 10-minute mean wind criteria to designate tropical cyclone maximum sustained winds.
The storm was downgraded back to depression status by JTWC around local midnight when centered approximately 395 km ( 245 mi ) east-northeast of Guam, though it was never recognized as a tropical storm by the Japan Meteorological Agency.
JTWC and for
The JTWC is responsible for the issuing of tropical cyclone warnings in the North West Pacific Ocean, South Pacific Ocean and Indian Ocean for United States Department of Defense interests, as well as U. S. and Micronesian civilian interests within the command's area of responsibility ( AOR ).
The Joint Typhoon Warning Center ( JTWC ) unofficially assumed warning duties for interests in the United States Department of Defense.
After later reanalysis, the JTWC raised the estimated wind speeds of John for every advisory from 1200 UTC September 1 to its final advisory exactly a week later by at least 5 knots ( 9 km / h, 6 mph ) and as much as 25 knots ( 46 km / h, 29 mph ).
A small, concentrated area of convection quickly developed over a low-pressure area within the trough, and on November 2 it became sufficiently organized for the Joint Typhoon Warning Center ( JTWC ) to issue a Tropical Cyclone Formation Alert.
This difference generally means that JTWC maximum winds will appear to be higher than the maximum winds described by the JMA for the same cyclone.
The JTWC finally issued a warning for this system at 1500 UTC October 7 ( 2300 local time ), and tropical depression number 20W was issued to the system.
JTWC finally issued a warning for Kirogi at 0900 UTC, October 10, despite listing it as a Tropical Depression.
This difference generally results in JTWC maximum winds appearing higher than the maximum winds described by the JMA for the same cyclone.
The JTWC had a backup facility in Monterrey, California for the first time in 2002, having moved from Yokosuka, Kanagawa in Japan.
This difference generally results in JTWC maximum winds appearing higher than the maximum winds described by the JMA for the same cyclone.
The JTWC estimated peak winds of 270 km / h ( 165 mph ), and the agency estimated that Fengshen was a super typhoon for five days.
However when the JTWC started to issue advisories for this tropical depression they did not consider this depression to be a redevelopment of Tropical Storm 18W, instead they considered it to be a new Tropical Depression designating it Tropical Depression 20W.
This difference generally results in JTWC maximum winds appearing higher than the maximum winds described by the JMA for the same cyclone.
This difference generally results in JTWC maximum winds appearing higher than the maximum winds described by the JMA for the same typhoon.
The Joint Typhoon Warning Center ( JTWC ) issued a Tropical Cyclone Formation Alert for a developing broad circulation which stretched out from the northwest Borneo coast early on January 4.
JTWC and storm
At 1200 UTC on December 9, the JTWC assessed Paka as an 85 km / h ( 50 mph ) tropical storm and forecast it to continue weakening.
By December 10, the shear had begun to decrease as the storm moved through the Marshall Islands, and that night the JTWC upgraded Paka to typhoon status.
As John persisted and did not dissipate as the JTWC had predicted, it was upgraded to a minimal tropical storm in the next advisory.
Although already a tropical storm, the JTWC did not issue their first advisory on the system until early on June 13, at which time they assigned it the name Yunya.
Early on January 15, the JTWC upgraded 01W to a tropical storm as the system turned towards the north.
Late on January 18, the JTWC issued their final advisory on Kulap despite the storm remaining tropical.
In the six years since current naming conventions were introduced, this was the 12th time the JTWC recognised a tropical storm not named by the JMA, after three storms in the 2001 Pacific typhoon season, two storms each in 2000, 2002, and 2004 and one each in 2003 and 2005.
The JTWC briefly upgraded it to a tropical storm on September 24.
In the six years since current naming conventions were introduced, this was the 13th time the JTWC recognised a tropical storm not named by the JMA.
In the post-season analysis supplied by the JTWC, it was determined that 17W never reached tropical storm intensity, thus it was downgraded to a tropical depression.
It was upgraded to a 35-kt tropical storm by both JTWC and JMA on August 27 00: 00 UTC, the tropical cyclone being assigned the name Talim.
JTWC issued the final warning on the same day while JMA continued to maintain the system as a tropical storm, downgrading Talim to a tropical depression at September 2 06: 00 UTC.
The depression gradually intensified and was upgraded to Tropical Storm 21W by the Joint Typhoon Warning Center ( JTWC ) early on August 27 when located about 590 km ( 365 mi ) east of Guam ; however, in post-season analysis, the JTWC declassified 21W as a tropical storm.
By the following day, the storm had undergone rapid intensification to attain its peak ten-minute sustained and one-minute sustained winds of 175 km / h ( 110 mph ) and 230 km / h ( 145 mph ) according to the JMA and JTWC respectively.
In storm information below, wind-speed advisories differ from the Joint Typhoon Warning Center ( JTWC ) to the JMA as the JTWC uses the United States criteria of 1-minute mean to designate maximum sustained winds, while the JMA uses the 10-minute mean wind criteria to designate tropical cyclone maximum sustained winds.
In storm information below, wind-speed advisories differ from the Joint Typhoon Warning Center ( JTWC ) to the JMA as the JTWC uses the United States criteria of 1-minute mean to designate maximum sustained winds, while the JMA uses the 10-minute mean wind criteria to designate tropical cyclone maximum sustained winds.
The JTWC estimated peak winds of 260 km / h ( 160 mph ) while the storm was located about 610 km ( 380 mi ) east of Catanduanes in the Philippines ; this made Mitag a super tyhoon, the first one on record in the month of March.
Later that day, the JTWC upgraded the depression to a tropical storm, and on June 8 the JMA upgraded the depression to Tropical Storm Noguri halfway between Taiwan and Luzon.
The convection diminished, and the JTWC declared Noguri extratropical while the storm was approaching Japan.
JTWC and intensity
Based on estimates provided through the use of the Dvorak technique, the JTWC assessed Gay to have attained its peak intensity as a Category 5-equivalent cyclone with winds of 260 km / h ( 160 mph ) early on November 8.
However, at the same time the JMA assessed Kulap to have reached its peak intensity, the JTWC classified it as a minimal typhoon with winds of 120 km / h ( 75 mph ).
Rananim reached its peak intensity on August 11 with winds of 150 km / h ( 90 mph ); the JTWC estimated the system to be slightly stronger, peaking with winds of 165 km / h ( 105 mph ).
JTWC and tropical
JTWC monitors, analyzes, and forecasts tropical cyclone formation, development, and movement year round.
Typhoon Tip ( international designation: 7920, JTWC designation: 23W, PAGASA name: Warling ) was the largest and most intense tropical cyclone ever recorded.
Hurricane John ( also known as Typhoon John, international designation: 9420, JTWC designation: 10E ) formed during the 1994 Pacific hurricane season and became both the longest-lasting and the farthest-traveling tropical cyclone ever observed.
The 1991 Bangladesh cyclone ( IMD designation: BOB 01, JTWC designation: 02B ) was among the deadliest tropical cyclones on record.
The JTWC designated it as a tropical depression, 15W, at 9 p. m. UTC September 12.
Typhoon Talim ( international designation: 0513, JTWC designation: 13W, PAGASA name: Typhoon Isang ) was a tropical cyclone that passed over Taiwan on the night of August 31-September 1, 2005, and over Southeast China on September 2.
0.295 seconds.